Adding Integers Adding Integers with the Same Sign

Adding Integers with the Same Sign �When adding integers with the same sign, the

Additive Inverse Property �The integers 5 and -5 are called opposites because they are

Adding Integers with Different Signs �To add integers with different signs, subtract their absolute

Subtracting Integers �To subtract an integer, add its opposite. �Examples: � 4 – 9

Integer Cube Game � Each pair or group of 3 will be given 2

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Adding Integers

Adding Integers with the Same Sign �When adding integers with the same sign, the sum will be: Positive if both integers are positive. Negative if both integers are negative. Examples: 7 + 4 = 11 -7+ (-4) = -11

Additive Inverse Property �The integers 5 and -5 are called opposites because they are the same distance from zero, but on opposite sides of zero. �Two integers that are opposites are also called additive inverses. �The sum of any number and its additive inverse is 0 (zer 0). �Example: 5+ (-5) = 0

Adding Integers with Different Signs �To add integers with different signs, subtract their absolute values. �The sum is: Positive if the positive integer’s absolute value is greater. Negative if the negative integer’s absolute value is greater. Examples: 9 + (-4) = 5 -9 + 4 = -5

Subtracting Integers �To subtract an integer, add its opposite. �Examples: � 4 – 9 = 4 + (-9) = -5 � 7 – (-10) = 7 + (10) = 17

Integer Cube Game � Each pair or group of 3 will be given 2 integer cubes. � In your group, take turns rolling the integer cubes. � The student who rolls writes an addition problem using the two integers from the roll and then finds the sum. � Each student must record his/her addition problems and the sums on a sheet of paper. � Each student is responsible for keeping a running total of his/her sums. � The first student in the group who reaches a sum of 15 wins!